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UNITED STATES PATENT OFFICE.

OTTO THIEME AND FREDERICK OTTO MUELLER, OF ST. LOUIS, MISSOURI, ASSIGNORS T0 MOON-HOPKINS BILLING MACHINE COMPANY, OF LOUIS, MISSOURI, A CORPO- RATION OF MISSOURI.

PRESSURE-ROLLER FOR TYPEhVRITING-MACHINES, 8w.

Application filed August 16, 1917.

To all whom it may concern:

Be it known that we, OTTo THIEME and FREDERICK OTTo MUELLER, citizens of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Pressure-Rollers for Typewriting-Machines, &c., of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a detail view of the axle or bar on which the pressure rollers are mounted.

Fig. 2 is a detail view of the pressure roller and its associate parts in their disassembled relation.

Fig. 3 is a vertical cross sectional view showing a pressure roller as applied to the platen on an ordinary typewriting machine.

Figs. 4, 5, and 6 are diagrammatic views illustrating the independent adjustment of the frames.

This invention relates to a new and useful improvement in pressure rollers for typewriting machines, the object being to construct a roller of the character described which is easily adjustable and cheaply manufactured and one which will exert with its companions a uniform pressure on the paper carried by the platen regardless of the thickness of the paper at different points along the length of the platen. The roller is made up in sections, each section of which is independently adjustable and in combined adding and typewriting machines where there is a split platen, i. 6., a platen divided into sections each of which is capable of independent rotation for receiving papers of different thicknesses, such as may be employed in making out invoices, ledger sheets and the like, our improved pressure roller is especially adaptable.

In the drawings 1 indicates the frame of a laterally movable paper carriage; 2 is the platen arranged therein; 3 is a rod or shaft mounted in suitable bearings at each end whereby the same may be moved toward and away from the platen. These means are not Specification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 186,475.

shown in the drawings as they form no part of our present invention. This shaft is provided with a number of threaded openings for receiving screws 5. 6 is a frame piece preferably made of pressed metal having perforated lugs or ears 7 by which it is strung on the shaft 3. This frame plate also has perforated lugs or ears 8 in which is mounted a pressure roller 9, said pressure roller preferably having a removable shaft 10 threaded at one end to receive a nut 11 by which the roller is held in position in'the frame.

12 indicates a flat leaf spring bent substantially in the form of an 3 one end of which is slotted at 13 to receive the screw 5. In assembling the parts, the sections of the pressureroller are preferably mounted in their respective frames after which the frames are strung on the shaft and the springs arranged in position. The screws are then passed through the slots in the springs and into the threaded openings in the shaft and turned down until the frames are approximately in their proper position. The shaft is now mounted in its bearings and the parts are finally adjusted by turning the screws tightly home to lock the frames in their final position. Each section of the pressure roller is thus capable of independent adjustment and by moving the frame and the S-shapecl spring about the shaft as much or as little pressure may be placed on the sections of the pressure roller as is desired. An advantageous feature of these independently adjustable sections lies in the adaptability of the shaft to accommodate itself to the difierent thicknesses of the paper at different points along the length of the platen because the sections of the pressure roller, even though not accurately adjusted, will adapt themselves to the different thicknesses of the paper and each pressure roller section will exert uniform pressure on the paper or different thicknesses of paper.

In Figs. 4, 5, and 6, we have diagrammatically illustrated the independent adjustment of the frames incident to the adjustment of the spring 12 on rod 3. In these views we have illustrated, in an exaggerated manner, sheets of paper a, there being three of said sheets shown in Fig. 4:, two in Fig. 5, and

I w. w. TODENWARTH.

HYDROCARBON BURNER.

APPLICATION FILED MAY 15, 1919.

1 ,336,798, Patented Apr. 13, 1920.

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